# std::chrono::month

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< cpp‎ | chrono

Defined in header `<chrono>` |  |
class month; |  | (since C++20)
inline constexpr std::chrono::month January{1}; |  | (since C++20)
inline constexpr std::chrono::month February{2}; |  | (since C++20)
inline constexpr std::chrono::month March{3}; |  | (since C++20)
inline constexpr std::chrono::month April{4}; |  | (since C++20)
inline constexpr std::chrono::month May{5}; |  | (since C++20)
inline constexpr std::chrono::month June{6}; |  | (since C++20)
inline constexpr std::chrono::month July{7}; |  | (since C++20)
inline constexpr std::chrono::month August{8}; |  | (since C++20)
inline constexpr std::chrono::month September{9}; |  | (since C++20)
inline constexpr std::chrono::month October{10}; |  | (since C++20)
inline constexpr std::chrono::month November{11}; |  | (since C++20)
inline constexpr std::chrono::month December{12}; |  | (since C++20)

The class `month` represents a month in a year. Its normal range is `[`1`,` 12`]`, but it may hold any number in `[`​0​`,` 255`]`. Twelve named constants are predefined in the `std::chrono` namespace for the twelve months of the year.

`month` is a TriviallyCopyable StandardLayoutType.

### Member functions

(constructor) | constructs a `month` (public member function)
operator++operator++(int)operator--operator--(int) | increments or decrements the month (public member function)
operator+=operator-= | adds or subtracts a number of months (public member function)
operator unsigned | retrieves the stored month value (public member function)
ok | checks if the stored month value is in the normal range (public member function)

### Nonmember functions

operator==operator<=> (C++20) | compares two `month` values (function)
operator+operator- (C++20) | performs arithmetic on `month`s (function)
operator<< (C++20) | outputs a `month` into a stream (function template)
from_stream (C++20) | parses a `month` from a stream according to the provided format (function template)

### Helper classes

std::formatter<std::chrono::month> (C++20) | formatting support for `month` (class template specialization)
std::hash<std::chrono::month> (C++26) | hash support for `std::chrono::month` (class template specialization)

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